3.2 Programming

Question 1

Data types (pseudo code)

Answer 1

• integer (INT)
• real (REAL)
• Boolean (BOOL): 2 values (true/false, yes/no)
• character (CHAR)
• string (STRING)

Question 2

advantages of subroutine

Answer 2

• allows code to be reused
• would be easier to test
• code could be changed/updated without affecting overall program
• makes program easier to read/understand

Question 3

Selection equations

Answer 3

IF-THEN-ELSE statements
ELSE-IF statements
- nested (IF statement inside another)

Question 4

Iteration examples

Answer 4

FOR loops
REPEAT-UNTIL loops
WHILE loops
DO-WHILE loops

Question 5

Types of iteration statements

Answer 5

• indefinite = no. of repeats depends on a condition (WHILE, REPEAT-UNTIL)
• definite = repeat exact number of times (FOR)